Blast-furnace tuyere short-circuit fire-retardant plugboard

Abstract

The utility model provides a blast-furnace tuyere short-circuit fire-retardant plugboard, and relates to the field of blast furnace ironmaking. Comprising a plane metal plate, a transverse plate and a side plate, the transverse plate and the plane metal plate are oppositely arranged, the outer side edge of the transverse plate is connected with the plane metal plate through the side plate, and the transverse plate, the side plate and the plane metal plate are matched to form a slot; wherein the plane metal plate is provided with a plugging area used for covering a short-circuit flange plate of the blast-furnace tuyere, the transverse plate is arranged along one part of the periphery of the plugging area, and the side plate is connected with the side edge, away from the center of the plugging area, of the transverse plate; the slot is used for being clamped with part of the outer edge of a short-circuit flange plate of the blast-furnace tuyere, so that the surface, facing the transverse plate, of the plugging area of the plane metal plate is pressed on the end face of the short-circuit flange plate. According to the utility model, flames generated by tempering of the short circuit of the air supply device can be prevented, so that the construction operation safety of workers is ensured, and meanwhile, the simple sealing effect on the air supply device of the blast furnace can be achieved.

Description

Technical Field

[0001] This invention relates to the field of blast furnace ironmaking, and in particular to a safety isolation technology used to prevent safety accidents such as burns, scalds, gas poisoning, deflagration, and explosions during blast furnace maintenance or replacement of tuyere devices. Background Technology

[0002] During blast furnace ironmaking, blast furnace shutdowns are frequently required to address issues with the tuyeres, including replacing the inner and outer sleeves, fixing leaks, and replacing direct-blowing pipes. These operations often require workers to crouch directly beneath the tuyeres, where the air supply system's short-circuit junction is located. Since the blast furnace's air supply system surrounds the furnace, all tuyeres are interconnected. Blast furnace gas can flow back through the air supply pipes from unremoved tuyeres into the short-circuit junction where workers are operating. This can create flammable gas, causing flame ejection or deflagration, easily leading to burns or gas poisoning. Typically, when this situation occurs, safety supervisors can only urge workers to quickly evacuate the work area and resume operations once the working environment stabilizes. This method does not fundamentally eliminate the safety hazard.

[0003] The commonly used operating methods in China currently have the following drawbacks:

[0004] 1. Evacuation can only be carried out after the fact, not prevented in advance;

[0005] 2. High requirements for furnace condition before shutdown. Shutting down the tuyeres and repairing the blast furnace is not permitted under abnormal furnace conditions.

[0006] 3. Deflagration will generate negative pressure and draw in a large amount of cold air, causing the temperature inside the air supply device's duct to rise and fall sharply. The severe thermal shock will affect the service life of the refractory material.

[0007] Given the aforementioned shortcomings of currently used methods, a new design approach and solution are urgently needed. Summary of the Invention

[0008] The purpose of this utility model is to provide a short-circuit fire arrestor plug for air vents to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, this utility model provides the following technical solution: a blast furnace tuyere short-connection flame arrestor plate, used for installation on the blast furnace tuyere short-connection flange, characterized in that:

[0010] The blast furnace tuyeres short-circuit fire-arresting baffle plate includes a flat metal plate, a horizontal plate, and a side plate. The horizontal plate and the flat metal plate are positioned opposite each other. The outer edge of the horizontal plate is connected to the flat metal plate through the side plate, and the horizontal plate, side plate, and flat metal plate cooperate to form a slot.

[0011] The flat metal plate has a sealing area for covering the short-connection flange of the blast furnace tuyere, a horizontal plate is provided along a portion of the periphery of the sealing area, and a side plate is connected to the side of the horizontal plate away from the center of the sealing area; a slot is used to engage with a portion of the outer edge of the short-connection flange of the blast furnace tuyere, so that the surface of the flat metal plate facing the horizontal plate is pressed against the end face of the short-connection flange.

[0012] The above-mentioned blast furnace tuyeres short-connection flame arrestor plate is further preferably provided with a support structure on the surface of the horizontal plate facing the flat metal plate. The support structure is used to abut against another surface of the outer edge of the short-connection flange when the flat metal plate is pressed against the end face of the short-connection flange, so as to provide the flat metal plate with a force towards the end face of the short-connection flange.

[0013] The above-mentioned blast furnace tuyeres short-connection flame arrestor plate is further preferably supported by a sliding strip with an elastic support. The sliding strip with the elastic support can exert a downward elastic force on the flange, thereby making the metal plate fit tightly against the flange.

[0014] The above-mentioned blast furnace tuyere short-connection flame arrestor plate is further preferably supported by a roller with an elastic support, which makes it easy to install the blast furnace tuyere short-connection flame arrestor plate onto the flange.

[0015] The above-mentioned blast furnace tuyere short-circuit fire-arresting plate is further preferably made of ordinary metal material.

[0016] The above-mentioned blast furnace tuyere short-circuit fire-arresting plate is further preferably characterized in that the thickness of the flat metal plate, horizontal plate and side plate of the blast furnace tuyere short-circuit fire-arresting plate is at least 0.3 mm.

[0017] The blast furnace tuyere short-circuit fire-arresting plug as described above is further preferably equipped with a handle, which is mounted on the middle side plate of the slot.

[0018] Analysis shows that, compared with the prior art, the advantages and beneficial effects of this utility model are as follows:

[0019] In this invention, the blast furnace tuyere short-circuit flame arrestor plate is installed on the blast furnace tuyere short-circuit flange to prevent flames generated by short-circuit backfire of the air supply device, thus ensuring the safety of workers during construction. It also provides a simple sealing effect for the blast furnace air supply device. Not only is it easy to operate and manufacture, but it also reduces the temperature drop of the refractory material inside the air supply device, extending its service life. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a short-circuit fire arrestor plug in an embodiment of this utility model;

[0021] Figure 2This describes the situation during air vent operation in this embodiment of the utility model;

[0022] Figure 3 illustrates the installation and use method of a short-circuit fire-retardant plug for air vents in an embodiment of this utility model.

[0023] In the diagram: 1. Tuyere short-circuit flange in the blast furnace air supply system; 2. Flame directly ejected from the pipe of the short-circuit flange; 3. Tuyere short-circuit flame arrestor plate; 4. Support device.

[0024] In the diagram: 1. Flat metal plate; 11. Flat metal plate sealing area; 12. Flat metal plate surrounding area; 2. Slot; 21. Horizontal plate; 22. Side plate; 3. Handle; 4. Support structure; 5. Blast furnace tuyeres short-connection flange. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation and not by way of limitation. Indeed, those skilled in the art will recognize that modifications and variations can be made to the invention without departing from its scope or spirit. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the invention encompass such modifications and variations falling within the scope of the appended claims and their equivalents.

[0026] In the description of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "connected," "linked," and "set up" used in this invention should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a direct connection or an indirect connection through intermediate components; a wired connection, a radio connection, or a wireless communication signal connection. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0027] Before understanding this utility model, it is important to understand that during the blast furnace ironmaking process, the tuyeres are often shut down for maintenance. At this time, workers are directly below the tuyeres of the air supply device, and blast furnace gas will backflow into the tuyeres where the workers are located, forming combustible gas and causing flame ejection or deflagration, which threatens the personal safety of the workers.

[0028] like Figure 1As shown, this utility model provides a technical solution: a blast furnace tuyere short-connection flame arrestor plate, used for installation on the blast furnace tuyere short-connection flange 5, wherein the blast furnace tuyere short-connection flame arrestor plate includes a flat metal plate 1 and a slot 2. The slot 2 includes a horizontal plate 21 and a side plate 22. The horizontal plate 21 is arranged opposite to the flat metal plate 1. The outer side of the horizontal plate 21 is connected to the peripheral area 12 of the flat metal plate through the side plate 22. Based on this structure, the side plate 2 and the horizontal plate 3 form the slot 2 with the flat metal plate 1.

[0029] Furthermore, the flat metal plate 1 has a sealing area 11 that covers the blast furnace tuyere short-connection flange 5, while the horizontal plate 21 is provided along a portion of the periphery area 12 of the flat metal plate, and the horizontal plate 21 and the side plate 22 are connected on the side away from the center of the sealing area; the slot 2 is used to engage with a portion of the outer edge of the blast furnace tuyere short-connection flange 5, so that the surface of the flat metal plate sealing area 11 facing the horizontal plate 21 is pressed against the end face of the short-connection flange 5.

[0030] Furthermore, the surface of the horizontal plate 21 facing the flat metal plate 1 is provided with a support structure 4. The support structure 4 is used to abut against another surface of the outer edge of the short flange 5 when the flat metal plate 1 is pressed against the end face of the short flange 5, so as to provide the flat metal plate 1 with a force toward the end face of the short flange 5.

[0031] Furthermore, the support structure 4 can be a sliding strip with an elastic support, which can generate a downward elastic force on the short-connection flange 5, thereby making the flat metal plate 1 fit tightly against the short-connection flange 5; the support structure 4 can also be a roller with an elastic support, which makes it easy to install the blast furnace tuyeres short-connection flame arrestor plate onto the short-connection flange 5, while achieving a better sealing effect.

[0032] Furthermore, the blast furnace tuyeres short-circuit fire-stopping plate is equipped with a handle 3, which is installed on the middle side plate 22 of the slot 2. Preferably, the handle 3 is equipped with a heat-insulating pad to prevent the user from being burned.

[0033] Furthermore, the flat metal plate 1, slot 2 (including the horizontal plate 21 and side plate 22), and handle 4 of the blast furnace tuyere short-connection flame arrestor are made of ordinary metal. The thickness of the flat metal plate 1 and slot 2 (including the horizontal plate 21 and side plate 22) of the blast furnace tuyere short-connection flame arrestor is at least 0.3 mm.

[0034] In one embodiment of the present invention, the flat metal plate 1 of the blast furnace tuyeres short-circuit flame arrestor is a regular octagon, and the slot 2 includes a horizontal plate 21 and a side plate 22. The horizontal plate 21 is arranged opposite to and parallel to the flat metal plate 1, and the outer side of the horizontal plate 21 is connected to the outer side of the flat metal plate through the side plate 22.

[0035] Furthermore, slots 2 are provided on the first to fifth sides of the flat metal plate 1 in a counterclockwise direction, while slots are not provided on the sixth to eighth sides of the flat metal plate 1, so that the blast furnace tuyere short-connection flame arrestor plate can be installed on the blast furnace tuyere short-connection flange.

[0036] Preferably, the flat metal plate 1 and slot 2 of the blast furnace tuyere short-connection flame arrestor are made of high-temperature resistant alloy metal, including the horizontal plate 21, side plate 22, and handle 4. A high-temperature heat-insulating coating is applied to the sealing area 11 of the flat metal plate to further enhance the heat insulation effect, thereby improving both safety and extending the service life of this invention. The thickness of the flat metal plate 1 and slot 2 of the blast furnace tuyere short-connection flame arrestor, including the horizontal plate 21 and side plate 22, is 0.5 mm.

[0037] like Figure 2 The image shows the situation during tuyeres operation in this application. In the process of blast furnace ironmaking, tuyeres are frequently handled, including replacing the tuyeres' middle and small sleeves, fixing tuyeres' air leakage, and replacing the direct blow pipes. When workers perform these operations, they are usually located directly below the tuyeres short-circuit of the air supply device. By installing the tuyeres short-circuit flame arrestor provided in this application, the safety of workers can be ensured, and the service life of the components at the tuyeres can also be extended.

[0038] like Figure 3A and Figure 3B As shown, this application provides an installation and usage method where the direct-blowing pipe installed at the blast furnace tuyeres is removed after the blast furnace is shut down. Figure 3A As indicated by the arrow, first attach the outer edge of the upper surface of the flat metal plate of the blast furnace tuyere short-connection flame arrestor plate to the lower surface of the blast furnace tuyere short-connection flange. Then, using the handle, push the flame arrestor plate parallel to the horizontal direction of the short-connection flange. At this point, the slots on both sides of the flame arrestor plate will insert into the outer edge of the short-connection flange. Continue pushing the handle until the slots of the flame arrestor plate completely cover the outer edge of the short-connection flange. At this point, the sealing area of ​​the flat metal plate of the flame arrestor plate completely covers the tuyere of the air supply device where the short-connection flange is located. Figure 3B As shown.

[0039] After the operator completes the work, pull the handle outward along the horizontal direction of the short-connection flange. At this time, the slot of the flame arrestor plate gradually disengages from the short-connection flange until the slot is completely disengaged from the short-connection flange. At this time, the flat metal plate sealing area of ​​the flame arrestor plate also fully opens the air outlet of the air supply device where the short-connection flange is located. After that, the operator can carry out subsequent construction work.

[0040] In summary, this application provides a flame arrestor for air vent short-connection flanges. By reliably blocking and sealing the air vent short-connection flanges, the working environment below them becomes more reliable and safer, thereby preventing various safety accidents. Simultaneously, the flame arrestor also prevents cold air from flowing back into the hot air duct of the air vent short-connection flange, providing not only thermal insulation but also stopping the flow of hot air within the duct, minimizing heat loss and reducing the possibility of deflagration.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A blast furnace tuyere short-circuiting fire-resistant plugboard for mounting on a blast furnace tuyere short-circuiting flange, characterized in that: the blast furnace tuyere short-circuiting fire-resistant plugboard comprises a flat metal plate (1), a horizontal plate (21) and a side plate (22), wherein the horizontal plate (21) is arranged opposite to the flat metal plate (1), the outer side of the horizontal plate (21) is connected to the flat metal plate (1) through the side plate (22), and the horizontal plate (21), the side plate (22) and the flat metal plate (1) cooperate to form a plug slot (2); wherein: the flat metal plate (1) has a plugging area (11) for covering the short-circuiting flange (5) of the blast furnace tuyere, the horizontal plate (21) is arranged along a part of the periphery of the plugging area (11), and the side plate (22) is connected to the side of the horizontal plate (21) away from the center of the plugging area (11); the plug slot (2) is used for clamping part of the outer edge of the short-circuiting flange (5) of the blast furnace tuyere, so that the plugging area (11) of the flat metal plate is pressed onto the end face of the short-circuiting flange (5) towards the surface of the horizontal plate (21). The horizontal plate (21) is provided with a support structure (4) towards the surface of the flat metal plate (1), which is used to abut another surface of the outer edge of the short-circuiting flange (5) when the flat metal plate (1) is pressed onto the end face of the short-circuiting flange (5), so as to provide a force acting on the flat metal plate (1) towards the end face of the short-circuiting flange (5). The support structure (4) can be a sliding bar with elastic supports, which can generate a downward elastic force on the flange (5), so that the metal plate (1) is tightly attached to the flange (5).

2. A damper plate for a high pressure furnace according to claim 1, wherein The support structure (4) can also be a roller with elastic supports, so that the blast furnace tuyere short-circuiting fire-resistant plugboard is easy to mount on the flange (5).

3. A stopper plate for a high pressure gas furnace according to claim 2, wherein The blast furnace tuyere short-circuiting fire-resistant plugboard is made of ordinary metal material.

4. A damper plate for a high pressure gas furnace according to claim 2, wherein The thickness of the flat metal plate (1), the horizontal plate (21) and the side plate (22) of the blast furnace tuyere short-circuiting fire-resistant plugboard is at least 0.3 mm.

5. A damper plate for a high pressure gas furnace according to claim 2, wherein The blast furnace tuyere short-circuiting fire-resistant plugboard is provided with a handle (3) mounted on the middle side plate (22) of the plug slot (2).

6. A damper plate for a high pressure furnace according to claim 1, wherein ​ 7. A damper plate for a high pressure furnace according to claim 1, wherein ​

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